Go into a 2nd tear crafting society i.e. an outfitters society and accept a workshop task. I have one for making shaped iron spears. To finish the quest you must make whatever it is that they want you to make and give it to the guy you get the quest from. To make much more money though you can sell the item to the wholesaler and still have the credit of making the item, allowing you to get a bonus of x amount of plat for doing the items, and x amount of plat for selling them to the wholesaler.
I got 3sp for each spear, and got 12sp for doing the quest.